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COSRX The Vitamin C 23 Serum is a lightweight yet potent brightening serum formulated with 23% pure Vitamin C (ascorbic acid) to target dark spots, uneven tone, and early signs of aging, while also improving skin radiance and texture. Enriched with hyaluronic acid and allantoin, it hydrates and soothes the skin, reducing irritation often caused by high-strength Vitamin C. Best suited for normal, combination, and oily skin types that can tolerate active ingredients, though sensitive skin should patch-test first due to its high concentration.